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Definitive 2000-2006 cab-area rain water leak thread

Discussion in '1st Gen Tundras (2000-2006)' started by shifty`, Jul 8, 2020.

  1. Jul 8, 2020 at 10:10 AM
    #1
    shifty`

    shifty` [OP] Better to piss in sink than to sink in piss

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    1st GEN CONTENT FOLLOWS!

    I was looking to see if anyone had a laundry-list of common fresh water or rain leaks for the Gen1 Tundras but couldn't find a sticky-able centralized source for all leaks to either pin or act as a main reference. I was hoping to go through and check a lot of these to work on proactively - leaks are inevitable, manufacturers rarely design cabins that are rain-proof for the long term.

    Since I was pulling the info on my own to start working through these on my '06, I thought I'd do something useful and create a go-to thread. This thread assumes you've checked for obvious stuff, like ... making sure the A/C condensate drain nipple in the engine bay on the passenger's side of the firewall is clear, you're sure this is not coolant, i.e. you're not smelling coolant in the puddle, and you checked some more-obvious sources like roof lights and sunroof drains being clogged (if you have one), sunroof seal.

    One tip to add if you're here and troubleshooting rainwater leaks: Classic "Duck" brand packing tape and a water hose is a GREAT combo to isolate a leak source. If you believe it's the 3rd brake light, try taping it over with clear packing tape, then hit it with a hose to see if it's still leaking. If it is, it's probably another source - try taping across the top of the rear window seal now, and test again. If it's still there, maybe tape the roof rack rails from end-to-end and try again. Keep going until the leak stops. A few of us have used the tape trick to rule out possibles, and you can leave the tape on as long as you like. Turtle Wax's sticker and adhesive remover ($6-8/can at any parts store) easily and safely removes any tape residue.

    Clearly - and to the point of this thread - other members have found and fixed a few common sources of leaks. Here are the ones I could find, categorized with an explanation, with the most common solutions and part number where applicable and threads linked to it if you want more reading. If anyone has new things to add, I'm not anyone's boss, but it could be cool to add here. If you tag me in your reply, I'll insert your fix into this list when time permits

    :mudding:

    Cowl fasteners (all models) - The plastic fasteners that receive the screws to hold down our black plastic cowl vent cover have a foam seal that breaks down over time, allowing a leak over the blower motor area into the passenger floorboard. Scroll to the end of this thread to see a video of what I'm referencing. This usually manifests during water events like rainstorms and car washes. Toyota replacement p/n for the plastic fasteners with new foams is 90080-18055 and can be ordered to replace the existing parts. To fix, you need to remove both wipers, remove the black plastic grille from the cowl via its screws/snaps, find the fastener clips, remove the original cow fasteners and clean out the old gasket material, then either re-seal the original fastener with a marine-grade sealant or replace the part entirely (OEM is $1-2/ea). You'll probably want to buy a couple of the other little white and black plastic snaps helping holding the cowl down, they like to break when you pop up the cowl, more info and part numbers here. Related threads giving advice and showing the clips:

    https://www.tundras.com/threads/water-leak.50387/

    https://www.tundras.com/threads/dripping-into-the-cab.33888/

    https://www.tundras.com/threads/2004-toyota-tundra-water-leaks.28770/

    :mudding:

    Horizontal-sliding rear window (access cab models) - Drain hole for the slider can get clogged:

    https://www.tundras.com/threads/the-4-million-dollar-reinvestment-‘build’-a-chronological-story.46816/#post-1210451

    :mudding:

    General rear of cab/rear cab corners - First and easiest thing to check is the rubbers around the roof seals for damage like this that could be letting water seep in. Next common offender is the 3rd brake light gasket or the horizontal sliding window seals if you have one, but it seems often some found the drain at the top of the windshield where the black roof rack seals meet the rear window gasket (see here for info/cleaning tips) was clogged or cracked. Pull the roof rack seal up/out where it meets the top of the rear window gasket, check for stuff to clean out, seal seems to be the winner here, if not, the 3rd brake light seal (housing to roof) is the next culprit. Try using clear packing tape across the top seal of the 3rd brake light ... if leaking stops, you know it's the light.

    https://www.tundras.com/threads/3rd-brake-light-leak.92739/#post-2364671

    https://www.tundras.com/threads/2004-toyota-tundra-water-leaks.28770/

    https://www.tundras.com/threads/doublecab-water-leak.36232/

    https://www.tundras.com/threads/wha...1st-gen-tundra-today.2558/page-86#post-916108

    :mudding:

    Windshield Leaks - Doesn't seem to be overly common, but with any vehicle more than 10 years old you may find rust on the sheetmetal which your windshield seals onto or one of the upper three seals (two corner seals, middle horizontal seal) go bad, leading to leaks. This may lead to drip on the dash, the front floorboards, soaking of the visors or headliner, or even weep out of A-pillar trim:

    https://www.tundras.com/threads/windshield-leak.22252/

    https://www.tundras.com/threads/water-leak-in-cab.35593/

    :mudding:

    Possible A-pillar leak source - Clips holding A-pillar trim in place could leak, would probably show up around the passenger or driver side kick panel. Something to look at if cowl fasteners aren't your problem:

    https://www.tundras.com/threads/the-4-million-dollar-reinvestment-‘build’-a-chronological-story.46816/#post-1210455


    Thanks to everyone who posted and-or helped in the threads up there ^^ Knowledge is power.

    Here's a video of the cowl clips I mention up above, this very clearly shows at the 3m50s mark what the problem is, maybe a bit of a design flaw from Toyota, but this isn't the only truck with nearly the same cowl issue!

    https://www.youtube.com/watch?v=DxohSpBpb8A#t=3m50s
     
    Last edited: Jan 26, 2023 at 7:50 PM
  2. Jul 8, 2020 at 10:47 AM
    #2
    bmf4069

    bmf4069 Yup, that's car parts in a dishwasher

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  3. Jul 8, 2020 at 11:00 AM
    #3
    Rex Kramer

    Rex Kramer Vinyl Spinner

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    I noticed evidence of minute rainwater intrusion at the door right above both side mirrors, I traced down the point of entry and found weather stripping attached to the cab had flattened out over the years due to age & compression. The areas are circled in Blue. My solution was to treat the rubber weather stripping with ATP AT-205 Re-Seal, this treatment worked and I will periodically reapply ATP to prevent the seal from flattening in the future.





    InkedIMG_0343_LI.jpg
    InkedIMG_0342_LI.jpg
     
    Last edited: Jul 8, 2020
    Sunnier, shifty`[OP] and bmf4069 like this.
  4. Jul 8, 2020 at 11:14 AM
    #4
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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  5. Jul 8, 2020 at 11:16 AM
    #5
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Nice thread composition. This should be a sticky!
     
    shifty`[OP] likes this.
  6. Jul 8, 2020 at 12:07 PM
    #6
    shifty`

    shifty` [OP] Better to piss in sink than to sink in piss

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    Needs more hand!
     
  7. Jul 8, 2020 at 2:05 PM
    #7
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Someday maybe. I posted a Scooter picture in the other thread.
     
  8. Aug 5, 2020 at 7:04 AM
    #8
    Hartsy8

    Hartsy8 Resident Hockey Guy

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    Anyone with a 3rd gen having any issues? Wanting to get ahead of potential leaks before wet season arrives
     
  9. Aug 5, 2020 at 8:18 AM
    #9
    Darkness

    Darkness Allergic to white

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  10. Aug 5, 2020 at 9:16 AM
    #10
    ColoradoTJ

    ColoradoTJ I drink…and I know things. Staff Member

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    A metric buttload
    This is good stuff. Done
     
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  11. Aug 9, 2020 at 7:31 AM
    #11
    TX-TRD1stGEN

    TX-TRD1stGEN I'm not taking a knee

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    My rear window assembly was leaking through the upper driver's side corner. Went to a window place and they said the whole assembly would have to be replaced because it cannot be removed without breaking it.

    I was able to get it removed myself and reseal/reinstall. Doesn't leak anymore.

    IMG_20191110_110805.jpg
    IMG_20191110_110757.jpg
     
  12. Aug 9, 2020 at 7:41 AM
    #12
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    :yes:

    Good job! I love it when they say it can’t be done and you end up doing it with success!
     
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  13. Aug 25, 2020 at 3:13 PM
    #13
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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  14. Dec 21, 2020 at 2:29 PM
    #14
    Jack McCarthy

    Jack McCarthy Navigating the luminiferous ether to see the light

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    Nice find. I've got a leak coming in from the top of the windshield and leaking onto the tranny hump and another starting to leak all over the inside of the fuse panel cover located on the kick panel.

    I think it might be time to put my thumb up against a windshield chip and see what develops...:rolleyes:...with the no deductible windshield replacement and all.
     
  15. Mar 4, 2021 at 6:52 PM
    #15
    ZPhilip

    ZPhilip Custom title here

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    I’m also trying to find info but came up empty in the 2nd/3rd gen areas. I have rain water leaking onto my driver side footwell under the steering wheel. It only happens during very heavy rain and I can’t figure it out.
     
  16. Mar 16, 2021 at 9:59 AM
    #16
    BobTTundra

    BobTTundra New Member

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    shifty`[OP] likes this.
  17. May 4, 2022 at 9:57 AM
    #17
    w666

    w666 D. None of the above

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    My leak turned out to be something else altogether. I had wet spots in the corners by the rear seat, but none of the techniques here seemed to solve the problem. One day while standing in the rain I observed that the rainwater was dripping down the side of the window seal, and entering the cab through a sizeable gap. After several days of no rain I gently pried back the window gasket and squeezed liberal amounts of black RTV into the gaps (cleaning it up afterward, of course). Voila! No more water in my cabin!!

    https://www.youtube.com/shorts/f-XInpcErFc
     
  18. Jan 2, 2023 at 10:48 AM
    #18
    MEWaters

    MEWaters New Member

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    I just found I’m leaking and collecting in rear cab near / behind pass seatbelt. It’s winter, and we’ve been getting a lot of rain this year. With Temps below 30s majority of the time should I wait until warmer weather in spring when everything won’t be so brittle?
    Have not found the source of leak
     
  19. Jan 2, 2023 at 12:17 PM
    #19
    shifty`

    shifty` [OP] Better to piss in sink than to sink in piss

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    Check the rubber bulb seals all the way around the perimeter of the door opening (physically on the cab, not on the door). Look for rips. Some AC owners have found they're not sealing worth a damn back there. Unless you think the leak is coming in higher than that?

    You can also dust the wall of the truck inside the "supposedly sealed" area with baby powder to hunt for weep lines.
     
    w666 likes this.
  20. Jan 2, 2023 at 1:25 PM
    #20
    MEWaters

    MEWaters New Member

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    Pretty sure it’s coming in both sides where the roof strip meets the upper window gasket. They’re dried and cracked, lifted off and a space at the window gasket
     
  21. Jan 2, 2023 at 1:54 PM
    #21
    shifty`

    shifty` [OP] Better to piss in sink than to sink in piss

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    Clear packing tape is your friend. If you're expecting a lot of rain, tape off the gap between the top flange of the door and the roof, so no water can enter at that point anymore. If the leak stops, you know that's the initial entry point of the water.

    You just need to make sure there's no alternate way for the water to get to the seal from another spot :D
     

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